Bigen hair dye in powder form is a permament hair dye that colours all your grey hair. It has no ammonia so it's not harsh to the hair. Can also be used to color your beard and facial hair. HAIR-TYPE AND COLORING RESULT TENDENCYJust like fingerprints, hair type is unique to each individual. We have soft, medium, hard, thick, coarse, straight, curly, damaged, colored hair - with numerous combinations of all of the above! Also, natural (original) hair color and level of brightness (which is determined by melanin) varies greatly. There is black, brunette, red, blonde, and variations within each. Even when it comes to black hair color, there are many variations.Your coloring result is influenced by hair-type and beginning color. If your hair is fine and soft, and your natural color is light, then it is more likely to be influenced by chemical actions and will color stronger than expected. If your hair is hard and thick, and your natural color is dark, then it is less likely to be influenced by chemical actions and will color weaker than expected.In addition, color tends to deposit more strongly initially, then fades away more quickly onto damaged or color-treated hair. Virgin hair is more resistant to coloring.CARE - AFTER COLORING Good hair care is recommended on a daily basis, because your hair cannot repair itself without your help. Additionally, coloring results last longer with good hair care habits.RINSE JUST AFTER COLORINGIt is recommended to rinse hair thoroughly until water runs clear before shampooing. If hair is not well rinsed after coloring process, it may cause hair damage and color fading.CONDITIONER FOR COLOR-TREATED HAIR Conditioners designed for color-treated hair or with a pH value of 3 to 4 are recommended. For a while after coloring, some of your cuticles won't close as easily as they did before coloring